John Travolta & Olivia Newton-John - You're The One That I Want
It's impossible not to get in a good mood by this classic from the film version of the musical Grease. I had a major crush on Olivia Newton-John as Sandy, and I was not alone. She still looks fantastic here. "You're The One That I Want" was one of several hits from the 1978 movie, and probably the best, written by one of Newton-John's foremost writers/producers, fellow Australian John Farrar. The song is pure genius!